I have to agree on knowing all latin names, yes we all might know what a carnation is but when ordering online from the dutch auctions/suppliers you might find that you're looking for Dianthus, so you really should know (as a professional florist) both its latin (for ordering) and its common (for customers) but I have found that customers are interested in both - and it looks like you acutally know what you are talking about!! In the shop that I work prices are listed with latin names and common.